Transcript

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>> Authorities identifying the lone shooter who killed five police officers and wounded seven others in an attack during a protest in Dallas, Texas. The high powered gunfire heard in this disturbing cell phone video.>> Somebody's armed. Somebody's really armed to the teeth.>> An army official telling Reuters the gunman was 25 year old Micah X Johnson, a private first class in the US Army Reserve, who served in Afghanistan.

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Authorities calling the attack a calculated ambush that sent peaceful protesters running, and police ducking for cover. After an hour's long standoff Thursday night during which gunfire was exchanged, Johnson cornered in a downtown garage, was finally killed by a bomb-carrying robot.>> We saw no other option but to use our bomb robot.

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The suspect is deceased as a result of detonating the bomb. The suspect said he was upset at white people. The suspect stated he wanted to kill white people, especially white officers.>> A string of killings of black men by police in cities including Ferguson, Missouri, New York, Baltimore, and Chicago have given rise to the Black Lives Matter movement and spurred largely peaceful protests against excessive police force.

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Thursday's protest followed the killing of two more black men, one in Minnesota, the other a day earlier in Louisiana. US Attorney General Loretta Lynch saying the Justice Department would assist in the investigation into the shooting, which was the deadliest day for police in the United States since the September 11th attacks.